]>
Commit | Line | Data |
---|---|---|
6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
4b82d6e4 | 19 | #include <linux/blkdev.h> |
2e635a27 | 20 | #include <linux/module.h> |
e20d96d6 | 21 | #include <linux/buffer_head.h> |
2e635a27 CM |
22 | #include <linux/fs.h> |
23 | #include <linux/pagemap.h> | |
24 | #include <linux/highmem.h> | |
25 | #include <linux/time.h> | |
26 | #include <linux/init.h> | |
a9572a15 | 27 | #include <linux/seq_file.h> |
2e635a27 | 28 | #include <linux/string.h> |
2e635a27 | 29 | #include <linux/backing-dev.h> |
4b82d6e4 | 30 | #include <linux/mount.h> |
dee26a9f | 31 | #include <linux/mpage.h> |
75dfe396 CM |
32 | #include <linux/swap.h> |
33 | #include <linux/writeback.h> | |
8fd17795 | 34 | #include <linux/statfs.h> |
08607c1b | 35 | #include <linux/compat.h> |
95e05289 | 36 | #include <linux/parser.h> |
c59f8951 | 37 | #include <linux/ctype.h> |
6da6abae | 38 | #include <linux/namei.h> |
a9218f6b | 39 | #include <linux/miscdevice.h> |
1bcbf313 | 40 | #include <linux/magic.h> |
5a0e3ad6 | 41 | #include <linux/slab.h> |
90a887c9 | 42 | #include <linux/cleancache.h> |
22c44fe6 | 43 | #include <linux/ratelimit.h> |
4b4e25f2 | 44 | #include "compat.h" |
16cdcec7 | 45 | #include "delayed-inode.h" |
2e635a27 | 46 | #include "ctree.h" |
e20d96d6 | 47 | #include "disk-io.h" |
d5719762 | 48 | #include "transaction.h" |
2c90e5d6 | 49 | #include "btrfs_inode.h" |
c5739bba | 50 | #include "ioctl.h" |
3a686375 | 51 | #include "print-tree.h" |
5103e947 | 52 | #include "xattr.h" |
8a4b83cc | 53 | #include "volumes.h" |
b3c3da71 | 54 | #include "version.h" |
be6e8dc0 | 55 | #include "export.h" |
c8b97818 | 56 | #include "compression.h" |
2e635a27 | 57 | |
1abe9b8a | 58 | #define CREATE_TRACE_POINTS |
59 | #include <trace/events/btrfs.h> | |
60 | ||
b87221de | 61 | static const struct super_operations btrfs_super_ops; |
830c4adb | 62 | static struct file_system_type btrfs_fs_type; |
75dfe396 | 63 | |
acce952b | 64 | static const char *btrfs_decode_error(struct btrfs_fs_info *fs_info, int errno, |
65 | char nbuf[16]) | |
66 | { | |
67 | char *errstr = NULL; | |
68 | ||
69 | switch (errno) { | |
70 | case -EIO: | |
71 | errstr = "IO failure"; | |
72 | break; | |
73 | case -ENOMEM: | |
74 | errstr = "Out of memory"; | |
75 | break; | |
76 | case -EROFS: | |
77 | errstr = "Readonly filesystem"; | |
78 | break; | |
8c342930 JM |
79 | case -EEXIST: |
80 | errstr = "Object already exists"; | |
81 | break; | |
acce952b | 82 | default: |
83 | if (nbuf) { | |
84 | if (snprintf(nbuf, 16, "error %d", -errno) >= 0) | |
85 | errstr = nbuf; | |
86 | } | |
87 | break; | |
88 | } | |
89 | ||
90 | return errstr; | |
91 | } | |
92 | ||
93 | static void __save_error_info(struct btrfs_fs_info *fs_info) | |
94 | { | |
95 | /* | |
96 | * today we only save the error info into ram. Long term we'll | |
97 | * also send it down to the disk | |
98 | */ | |
99 | fs_info->fs_state = BTRFS_SUPER_FLAG_ERROR; | |
100 | } | |
101 | ||
102 | /* NOTE: | |
103 | * We move write_super stuff at umount in order to avoid deadlock | |
104 | * for umount hold all lock. | |
105 | */ | |
106 | static void save_error_info(struct btrfs_fs_info *fs_info) | |
107 | { | |
108 | __save_error_info(fs_info); | |
109 | } | |
110 | ||
111 | /* btrfs handle error by forcing the filesystem readonly */ | |
112 | static void btrfs_handle_error(struct btrfs_fs_info *fs_info) | |
113 | { | |
114 | struct super_block *sb = fs_info->sb; | |
115 | ||
116 | if (sb->s_flags & MS_RDONLY) | |
117 | return; | |
118 | ||
119 | if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) { | |
120 | sb->s_flags |= MS_RDONLY; | |
121 | printk(KERN_INFO "btrfs is forced readonly\n"); | |
122 | } | |
123 | } | |
124 | ||
125 | /* | |
126 | * __btrfs_std_error decodes expected errors from the caller and | |
127 | * invokes the approciate error response. | |
128 | */ | |
129 | void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, | |
130 | unsigned int line, int errno) | |
131 | { | |
132 | struct super_block *sb = fs_info->sb; | |
133 | char nbuf[16]; | |
134 | const char *errstr; | |
135 | ||
136 | /* | |
137 | * Special case: if the error is EROFS, and we're already | |
138 | * under MS_RDONLY, then it is safe here. | |
139 | */ | |
140 | if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) | |
141 | return; | |
142 | ||
143 | errstr = btrfs_decode_error(fs_info, errno, nbuf); | |
144 | printk(KERN_CRIT "BTRFS error (device %s) in %s:%d: %s\n", | |
145 | sb->s_id, function, line, errstr); | |
146 | save_error_info(fs_info); | |
147 | ||
148 | btrfs_handle_error(fs_info); | |
149 | } | |
150 | ||
8c342930 JM |
151 | /* |
152 | * __btrfs_panic decodes unexpected, fatal errors from the caller, | |
153 | * issues an alert, and either panics or BUGs, depending on mount options. | |
154 | */ | |
155 | void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, | |
156 | unsigned int line, int errno, const char *fmt, ...) | |
157 | { | |
158 | char nbuf[16]; | |
159 | char *s_id = "<unknown>"; | |
160 | const char *errstr; | |
161 | struct va_format vaf = { .fmt = fmt }; | |
162 | va_list args; | |
163 | ||
164 | if (fs_info) | |
165 | s_id = fs_info->sb->s_id; | |
166 | ||
167 | va_start(args, fmt); | |
168 | vaf.va = &args; | |
169 | ||
170 | errstr = btrfs_decode_error(fs_info, errno, nbuf); | |
171 | if (fs_info->mount_opt & BTRFS_MOUNT_PANIC_ON_FATAL_ERROR) | |
172 | panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (%s)\n", | |
173 | s_id, function, line, &vaf, errstr); | |
174 | ||
175 | printk(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (%s)\n", | |
176 | s_id, function, line, &vaf, errstr); | |
177 | va_end(args); | |
178 | /* Caller calls BUG() */ | |
179 | } | |
180 | ||
d397712b | 181 | static void btrfs_put_super(struct super_block *sb) |
b18c6685 | 182 | { |
815745cf | 183 | (void)close_ctree(btrfs_sb(sb)->tree_root); |
aea52e19 AV |
184 | /* FIXME: need to fix VFS to return error? */ |
185 | /* AV: return it _where_? ->put_super() can be triggered by any number | |
186 | * of async events, up to and including delivery of SIGKILL to the | |
187 | * last process that kept it busy. Or segfault in the aforementioned | |
188 | * process... Whom would you report that to? | |
189 | */ | |
75dfe396 CM |
190 | } |
191 | ||
95e05289 | 192 | enum { |
73f73415 | 193 | Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum, |
287a0ab9 JB |
194 | Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, |
195 | Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress, | |
261507a0 LZ |
196 | Opt_compress_type, Opt_compress_force, Opt_compress_force_type, |
197 | Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard, | |
91435650 | 198 | Opt_space_cache, Opt_clear_cache, Opt_user_subvol_rm_allowed, |
9555c6c1 ID |
199 | Opt_enospc_debug, Opt_subvolrootid, Opt_defrag, Opt_inode_cache, |
200 | Opt_no_space_cache, Opt_recovery, Opt_skip_balance, | |
21adbd5c | 201 | Opt_check_integrity, Opt_check_integrity_including_extent_data, |
8c342930 | 202 | Opt_check_integrity_print_mask, Opt_fatal_errors, |
9555c6c1 | 203 | Opt_err, |
95e05289 CM |
204 | }; |
205 | ||
206 | static match_table_t tokens = { | |
dfe25020 | 207 | {Opt_degraded, "degraded"}, |
95e05289 | 208 | {Opt_subvol, "subvol=%s"}, |
73f73415 | 209 | {Opt_subvolid, "subvolid=%d"}, |
43e570b0 | 210 | {Opt_device, "device=%s"}, |
b6cda9bc | 211 | {Opt_nodatasum, "nodatasum"}, |
be20aa9d | 212 | {Opt_nodatacow, "nodatacow"}, |
21ad10cf | 213 | {Opt_nobarrier, "nobarrier"}, |
6f568d35 | 214 | {Opt_max_inline, "max_inline=%s"}, |
8f662a76 | 215 | {Opt_alloc_start, "alloc_start=%s"}, |
4543df7e | 216 | {Opt_thread_pool, "thread_pool=%d"}, |
c8b97818 | 217 | {Opt_compress, "compress"}, |
261507a0 | 218 | {Opt_compress_type, "compress=%s"}, |
a555f810 | 219 | {Opt_compress_force, "compress-force"}, |
261507a0 | 220 | {Opt_compress_force_type, "compress-force=%s"}, |
e18e4809 | 221 | {Opt_ssd, "ssd"}, |
451d7585 | 222 | {Opt_ssd_spread, "ssd_spread"}, |
3b30c22f | 223 | {Opt_nossd, "nossd"}, |
33268eaf | 224 | {Opt_noacl, "noacl"}, |
3a5e1404 | 225 | {Opt_notreelog, "notreelog"}, |
dccae999 | 226 | {Opt_flushoncommit, "flushoncommit"}, |
97e728d4 | 227 | {Opt_ratio, "metadata_ratio=%d"}, |
e244a0ae | 228 | {Opt_discard, "discard"}, |
0af3d00b | 229 | {Opt_space_cache, "space_cache"}, |
88c2ba3b | 230 | {Opt_clear_cache, "clear_cache"}, |
4260f7c7 | 231 | {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, |
91435650 | 232 | {Opt_enospc_debug, "enospc_debug"}, |
e15d0542 | 233 | {Opt_subvolrootid, "subvolrootid=%d"}, |
4cb5300b | 234 | {Opt_defrag, "autodefrag"}, |
4b9465cb | 235 | {Opt_inode_cache, "inode_cache"}, |
8965593e | 236 | {Opt_no_space_cache, "nospace_cache"}, |
af31f5e5 | 237 | {Opt_recovery, "recovery"}, |
9555c6c1 | 238 | {Opt_skip_balance, "skip_balance"}, |
21adbd5c SB |
239 | {Opt_check_integrity, "check_int"}, |
240 | {Opt_check_integrity_including_extent_data, "check_int_data"}, | |
241 | {Opt_check_integrity_print_mask, "check_int_print_mask=%d"}, | |
8c342930 | 242 | {Opt_fatal_errors, "fatal_errors=%s"}, |
33268eaf | 243 | {Opt_err, NULL}, |
95e05289 CM |
244 | }; |
245 | ||
edf24abe CH |
246 | /* |
247 | * Regular mount options parser. Everything that is needed only when | |
248 | * reading in a new superblock is parsed here. | |
249 | */ | |
250 | int btrfs_parse_options(struct btrfs_root *root, char *options) | |
95e05289 | 251 | { |
edf24abe | 252 | struct btrfs_fs_info *info = root->fs_info; |
95e05289 | 253 | substring_t args[MAX_OPT_ARGS]; |
73bc1876 JB |
254 | char *p, *num, *orig = NULL; |
255 | u64 cache_gen; | |
4543df7e | 256 | int intarg; |
a7a3f7ca | 257 | int ret = 0; |
261507a0 LZ |
258 | char *compress_type; |
259 | bool compress_force = false; | |
b6cda9bc | 260 | |
6c41761f | 261 | cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); |
73bc1876 JB |
262 | if (cache_gen) |
263 | btrfs_set_opt(info->mount_opt, SPACE_CACHE); | |
264 | ||
95e05289 | 265 | if (!options) |
73bc1876 | 266 | goto out; |
95e05289 | 267 | |
be20aa9d CM |
268 | /* |
269 | * strsep changes the string, duplicate it because parse_options | |
270 | * gets called twice | |
271 | */ | |
272 | options = kstrdup(options, GFP_NOFS); | |
273 | if (!options) | |
274 | return -ENOMEM; | |
275 | ||
da495ecc | 276 | orig = options; |
be20aa9d | 277 | |
edf24abe | 278 | while ((p = strsep(&options, ",")) != NULL) { |
95e05289 CM |
279 | int token; |
280 | if (!*p) | |
281 | continue; | |
282 | ||
283 | token = match_token(p, tokens, args); | |
284 | switch (token) { | |
dfe25020 | 285 | case Opt_degraded: |
edf24abe CH |
286 | printk(KERN_INFO "btrfs: allowing degraded mounts\n"); |
287 | btrfs_set_opt(info->mount_opt, DEGRADED); | |
dfe25020 | 288 | break; |
95e05289 | 289 | case Opt_subvol: |
73f73415 | 290 | case Opt_subvolid: |
e15d0542 | 291 | case Opt_subvolrootid: |
43e570b0 | 292 | case Opt_device: |
edf24abe | 293 | /* |
43e570b0 | 294 | * These are parsed by btrfs_parse_early_options |
edf24abe CH |
295 | * and can be happily ignored here. |
296 | */ | |
b6cda9bc CM |
297 | break; |
298 | case Opt_nodatasum: | |
067c28ad | 299 | printk(KERN_INFO "btrfs: setting nodatasum\n"); |
edf24abe | 300 | btrfs_set_opt(info->mount_opt, NODATASUM); |
be20aa9d CM |
301 | break; |
302 | case Opt_nodatacow: | |
edf24abe CH |
303 | printk(KERN_INFO "btrfs: setting nodatacow\n"); |
304 | btrfs_set_opt(info->mount_opt, NODATACOW); | |
305 | btrfs_set_opt(info->mount_opt, NODATASUM); | |
95e05289 | 306 | break; |
a555f810 | 307 | case Opt_compress_force: |
261507a0 LZ |
308 | case Opt_compress_force_type: |
309 | compress_force = true; | |
310 | case Opt_compress: | |
311 | case Opt_compress_type: | |
312 | if (token == Opt_compress || | |
313 | token == Opt_compress_force || | |
314 | strcmp(args[0].from, "zlib") == 0) { | |
315 | compress_type = "zlib"; | |
316 | info->compress_type = BTRFS_COMPRESS_ZLIB; | |
a6fa6fae LZ |
317 | } else if (strcmp(args[0].from, "lzo") == 0) { |
318 | compress_type = "lzo"; | |
319 | info->compress_type = BTRFS_COMPRESS_LZO; | |
261507a0 LZ |
320 | } else { |
321 | ret = -EINVAL; | |
322 | goto out; | |
323 | } | |
324 | ||
a555f810 | 325 | btrfs_set_opt(info->mount_opt, COMPRESS); |
261507a0 LZ |
326 | if (compress_force) { |
327 | btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); | |
328 | pr_info("btrfs: force %s compression\n", | |
329 | compress_type); | |
330 | } else | |
331 | pr_info("btrfs: use %s compression\n", | |
332 | compress_type); | |
a555f810 | 333 | break; |
e18e4809 | 334 | case Opt_ssd: |
edf24abe CH |
335 | printk(KERN_INFO "btrfs: use ssd allocation scheme\n"); |
336 | btrfs_set_opt(info->mount_opt, SSD); | |
e18e4809 | 337 | break; |
451d7585 CM |
338 | case Opt_ssd_spread: |
339 | printk(KERN_INFO "btrfs: use spread ssd " | |
340 | "allocation scheme\n"); | |
341 | btrfs_set_opt(info->mount_opt, SSD); | |
342 | btrfs_set_opt(info->mount_opt, SSD_SPREAD); | |
343 | break; | |
3b30c22f | 344 | case Opt_nossd: |
451d7585 CM |
345 | printk(KERN_INFO "btrfs: not using ssd allocation " |
346 | "scheme\n"); | |
c289811c | 347 | btrfs_set_opt(info->mount_opt, NOSSD); |
3b30c22f | 348 | btrfs_clear_opt(info->mount_opt, SSD); |
451d7585 | 349 | btrfs_clear_opt(info->mount_opt, SSD_SPREAD); |
3b30c22f | 350 | break; |
21ad10cf | 351 | case Opt_nobarrier: |
edf24abe CH |
352 | printk(KERN_INFO "btrfs: turning off barriers\n"); |
353 | btrfs_set_opt(info->mount_opt, NOBARRIER); | |
21ad10cf | 354 | break; |
4543df7e CM |
355 | case Opt_thread_pool: |
356 | intarg = 0; | |
357 | match_int(&args[0], &intarg); | |
358 | if (intarg) { | |
359 | info->thread_pool_size = intarg; | |
360 | printk(KERN_INFO "btrfs: thread pool %d\n", | |
361 | info->thread_pool_size); | |
362 | } | |
363 | break; | |
6f568d35 | 364 | case Opt_max_inline: |
edf24abe CH |
365 | num = match_strdup(&args[0]); |
366 | if (num) { | |
91748467 | 367 | info->max_inline = memparse(num, NULL); |
edf24abe CH |
368 | kfree(num); |
369 | ||
15ada040 CM |
370 | if (info->max_inline) { |
371 | info->max_inline = max_t(u64, | |
372 | info->max_inline, | |
373 | root->sectorsize); | |
374 | } | |
edf24abe | 375 | printk(KERN_INFO "btrfs: max_inline at %llu\n", |
21380931 | 376 | (unsigned long long)info->max_inline); |
6f568d35 CM |
377 | } |
378 | break; | |
8f662a76 | 379 | case Opt_alloc_start: |
edf24abe CH |
380 | num = match_strdup(&args[0]); |
381 | if (num) { | |
91748467 | 382 | info->alloc_start = memparse(num, NULL); |
edf24abe CH |
383 | kfree(num); |
384 | printk(KERN_INFO | |
385 | "btrfs: allocations start at %llu\n", | |
21380931 | 386 | (unsigned long long)info->alloc_start); |
8f662a76 CM |
387 | } |
388 | break; | |
33268eaf JB |
389 | case Opt_noacl: |
390 | root->fs_info->sb->s_flags &= ~MS_POSIXACL; | |
391 | break; | |
3a5e1404 SW |
392 | case Opt_notreelog: |
393 | printk(KERN_INFO "btrfs: disabling tree log\n"); | |
394 | btrfs_set_opt(info->mount_opt, NOTREELOG); | |
395 | break; | |
dccae999 SW |
396 | case Opt_flushoncommit: |
397 | printk(KERN_INFO "btrfs: turning on flush-on-commit\n"); | |
398 | btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT); | |
399 | break; | |
97e728d4 JB |
400 | case Opt_ratio: |
401 | intarg = 0; | |
402 | match_int(&args[0], &intarg); | |
403 | if (intarg) { | |
404 | info->metadata_ratio = intarg; | |
405 | printk(KERN_INFO "btrfs: metadata ratio %d\n", | |
406 | info->metadata_ratio); | |
407 | } | |
408 | break; | |
e244a0ae CH |
409 | case Opt_discard: |
410 | btrfs_set_opt(info->mount_opt, DISCARD); | |
411 | break; | |
0af3d00b | 412 | case Opt_space_cache: |
0af3d00b | 413 | btrfs_set_opt(info->mount_opt, SPACE_CACHE); |
0de90876 | 414 | break; |
73bc1876 JB |
415 | case Opt_no_space_cache: |
416 | printk(KERN_INFO "btrfs: disabling disk space caching\n"); | |
417 | btrfs_clear_opt(info->mount_opt, SPACE_CACHE); | |
418 | break; | |
4b9465cb CM |
419 | case Opt_inode_cache: |
420 | printk(KERN_INFO "btrfs: enabling inode map caching\n"); | |
421 | btrfs_set_opt(info->mount_opt, INODE_MAP_CACHE); | |
422 | break; | |
88c2ba3b JB |
423 | case Opt_clear_cache: |
424 | printk(KERN_INFO "btrfs: force clearing of disk cache\n"); | |
425 | btrfs_set_opt(info->mount_opt, CLEAR_CACHE); | |
0af3d00b | 426 | break; |
4260f7c7 SW |
427 | case Opt_user_subvol_rm_allowed: |
428 | btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); | |
429 | break; | |
91435650 CM |
430 | case Opt_enospc_debug: |
431 | btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); | |
432 | break; | |
4cb5300b CM |
433 | case Opt_defrag: |
434 | printk(KERN_INFO "btrfs: enabling auto defrag"); | |
435 | btrfs_set_opt(info->mount_opt, AUTO_DEFRAG); | |
436 | break; | |
af31f5e5 CM |
437 | case Opt_recovery: |
438 | printk(KERN_INFO "btrfs: enabling auto recovery"); | |
439 | btrfs_set_opt(info->mount_opt, RECOVERY); | |
440 | break; | |
9555c6c1 ID |
441 | case Opt_skip_balance: |
442 | btrfs_set_opt(info->mount_opt, SKIP_BALANCE); | |
443 | break; | |
21adbd5c SB |
444 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
445 | case Opt_check_integrity_including_extent_data: | |
446 | printk(KERN_INFO "btrfs: enabling check integrity" | |
447 | " including extent data\n"); | |
448 | btrfs_set_opt(info->mount_opt, | |
449 | CHECK_INTEGRITY_INCLUDING_EXTENT_DATA); | |
450 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); | |
451 | break; | |
452 | case Opt_check_integrity: | |
453 | printk(KERN_INFO "btrfs: enabling check integrity\n"); | |
454 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); | |
455 | break; | |
456 | case Opt_check_integrity_print_mask: | |
457 | intarg = 0; | |
458 | match_int(&args[0], &intarg); | |
459 | if (intarg) { | |
460 | info->check_integrity_print_mask = intarg; | |
461 | printk(KERN_INFO "btrfs:" | |
462 | " check_integrity_print_mask 0x%x\n", | |
463 | info->check_integrity_print_mask); | |
464 | } | |
465 | break; | |
466 | #else | |
467 | case Opt_check_integrity_including_extent_data: | |
468 | case Opt_check_integrity: | |
469 | case Opt_check_integrity_print_mask: | |
470 | printk(KERN_ERR "btrfs: support for check_integrity*" | |
471 | " not compiled in!\n"); | |
472 | ret = -EINVAL; | |
473 | goto out; | |
474 | #endif | |
8c342930 JM |
475 | case Opt_fatal_errors: |
476 | if (strcmp(args[0].from, "panic") == 0) | |
477 | btrfs_set_opt(info->mount_opt, | |
478 | PANIC_ON_FATAL_ERROR); | |
479 | else if (strcmp(args[0].from, "bug") == 0) | |
480 | btrfs_clear_opt(info->mount_opt, | |
481 | PANIC_ON_FATAL_ERROR); | |
482 | else { | |
483 | ret = -EINVAL; | |
484 | goto out; | |
485 | } | |
486 | break; | |
a7a3f7ca SW |
487 | case Opt_err: |
488 | printk(KERN_INFO "btrfs: unrecognized mount option " | |
489 | "'%s'\n", p); | |
490 | ret = -EINVAL; | |
491 | goto out; | |
95e05289 | 492 | default: |
be20aa9d | 493 | break; |
95e05289 CM |
494 | } |
495 | } | |
a7a3f7ca | 496 | out: |
73bc1876 JB |
497 | if (!ret && btrfs_test_opt(root, SPACE_CACHE)) |
498 | printk(KERN_INFO "btrfs: disk space caching is enabled\n"); | |
da495ecc | 499 | kfree(orig); |
a7a3f7ca | 500 | return ret; |
edf24abe CH |
501 | } |
502 | ||
503 | /* | |
504 | * Parse mount options that are required early in the mount process. | |
505 | * | |
506 | * All other options will be parsed on much later in the mount process and | |
507 | * only when we need to allocate a new super block. | |
508 | */ | |
97288f2c | 509 | static int btrfs_parse_early_options(const char *options, fmode_t flags, |
73f73415 | 510 | void *holder, char **subvol_name, u64 *subvol_objectid, |
e15d0542 | 511 | u64 *subvol_rootid, struct btrfs_fs_devices **fs_devices) |
edf24abe CH |
512 | { |
513 | substring_t args[MAX_OPT_ARGS]; | |
83c8c9bd | 514 | char *device_name, *opts, *orig, *p; |
edf24abe | 515 | int error = 0; |
73f73415 | 516 | int intarg; |
edf24abe CH |
517 | |
518 | if (!options) | |
830c4adb | 519 | return 0; |
edf24abe CH |
520 | |
521 | /* | |
522 | * strsep changes the string, duplicate it because parse_options | |
523 | * gets called twice | |
524 | */ | |
525 | opts = kstrdup(options, GFP_KERNEL); | |
526 | if (!opts) | |
527 | return -ENOMEM; | |
3f3d0bc0 | 528 | orig = opts; |
edf24abe CH |
529 | |
530 | while ((p = strsep(&opts, ",")) != NULL) { | |
531 | int token; | |
532 | if (!*p) | |
533 | continue; | |
534 | ||
535 | token = match_token(p, tokens, args); | |
536 | switch (token) { | |
537 | case Opt_subvol: | |
a90e8b6f | 538 | kfree(*subvol_name); |
edf24abe CH |
539 | *subvol_name = match_strdup(&args[0]); |
540 | break; | |
73f73415 JB |
541 | case Opt_subvolid: |
542 | intarg = 0; | |
4849f01d JB |
543 | error = match_int(&args[0], &intarg); |
544 | if (!error) { | |
545 | /* we want the original fs_tree */ | |
546 | if (!intarg) | |
547 | *subvol_objectid = | |
548 | BTRFS_FS_TREE_OBJECTID; | |
549 | else | |
550 | *subvol_objectid = intarg; | |
551 | } | |
73f73415 | 552 | break; |
e15d0542 XZ |
553 | case Opt_subvolrootid: |
554 | intarg = 0; | |
555 | error = match_int(&args[0], &intarg); | |
556 | if (!error) { | |
557 | /* we want the original fs_tree */ | |
558 | if (!intarg) | |
559 | *subvol_rootid = | |
560 | BTRFS_FS_TREE_OBJECTID; | |
561 | else | |
562 | *subvol_rootid = intarg; | |
563 | } | |
564 | break; | |
43e570b0 | 565 | case Opt_device: |
83c8c9bd JL |
566 | device_name = match_strdup(&args[0]); |
567 | if (!device_name) { | |
568 | error = -ENOMEM; | |
569 | goto out; | |
570 | } | |
571 | error = btrfs_scan_one_device(device_name, | |
43e570b0 | 572 | flags, holder, fs_devices); |
83c8c9bd | 573 | kfree(device_name); |
43e570b0 | 574 | if (error) |
830c4adb | 575 | goto out; |
43e570b0 | 576 | break; |
edf24abe CH |
577 | default: |
578 | break; | |
579 | } | |
580 | } | |
581 | ||
830c4adb | 582 | out: |
3f3d0bc0 | 583 | kfree(orig); |
edf24abe | 584 | return error; |
95e05289 CM |
585 | } |
586 | ||
73f73415 JB |
587 | static struct dentry *get_default_root(struct super_block *sb, |
588 | u64 subvol_objectid) | |
589 | { | |
815745cf AV |
590 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
591 | struct btrfs_root *root = fs_info->tree_root; | |
73f73415 JB |
592 | struct btrfs_root *new_root; |
593 | struct btrfs_dir_item *di; | |
594 | struct btrfs_path *path; | |
595 | struct btrfs_key location; | |
596 | struct inode *inode; | |
73f73415 JB |
597 | u64 dir_id; |
598 | int new = 0; | |
599 | ||
600 | /* | |
601 | * We have a specific subvol we want to mount, just setup location and | |
602 | * go look up the root. | |
603 | */ | |
604 | if (subvol_objectid) { | |
605 | location.objectid = subvol_objectid; | |
606 | location.type = BTRFS_ROOT_ITEM_KEY; | |
607 | location.offset = (u64)-1; | |
608 | goto find_root; | |
609 | } | |
610 | ||
611 | path = btrfs_alloc_path(); | |
612 | if (!path) | |
613 | return ERR_PTR(-ENOMEM); | |
614 | path->leave_spinning = 1; | |
615 | ||
616 | /* | |
617 | * Find the "default" dir item which points to the root item that we | |
618 | * will mount by default if we haven't been given a specific subvolume | |
619 | * to mount. | |
620 | */ | |
815745cf | 621 | dir_id = btrfs_super_root_dir(fs_info->super_copy); |
73f73415 | 622 | di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); |
b0839166 JL |
623 | if (IS_ERR(di)) { |
624 | btrfs_free_path(path); | |
fb4f6f91 | 625 | return ERR_CAST(di); |
b0839166 | 626 | } |
73f73415 JB |
627 | if (!di) { |
628 | /* | |
629 | * Ok the default dir item isn't there. This is weird since | |
630 | * it's always been there, but don't freak out, just try and | |
631 | * mount to root most subvolume. | |
632 | */ | |
633 | btrfs_free_path(path); | |
634 | dir_id = BTRFS_FIRST_FREE_OBJECTID; | |
815745cf | 635 | new_root = fs_info->fs_root; |
73f73415 JB |
636 | goto setup_root; |
637 | } | |
638 | ||
639 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
640 | btrfs_free_path(path); | |
641 | ||
642 | find_root: | |
815745cf | 643 | new_root = btrfs_read_fs_root_no_name(fs_info, &location); |
73f73415 | 644 | if (IS_ERR(new_root)) |
d0b678cb | 645 | return ERR_CAST(new_root); |
73f73415 JB |
646 | |
647 | if (btrfs_root_refs(&new_root->root_item) == 0) | |
648 | return ERR_PTR(-ENOENT); | |
649 | ||
650 | dir_id = btrfs_root_dirid(&new_root->root_item); | |
651 | setup_root: | |
652 | location.objectid = dir_id; | |
653 | location.type = BTRFS_INODE_ITEM_KEY; | |
654 | location.offset = 0; | |
655 | ||
656 | inode = btrfs_iget(sb, &location, new_root, &new); | |
4cbd1149 DC |
657 | if (IS_ERR(inode)) |
658 | return ERR_CAST(inode); | |
73f73415 JB |
659 | |
660 | /* | |
661 | * If we're just mounting the root most subvol put the inode and return | |
662 | * a reference to the dentry. We will have already gotten a reference | |
663 | * to the inode in btrfs_fill_super so we're good to go. | |
664 | */ | |
665 | if (!new && sb->s_root->d_inode == inode) { | |
666 | iput(inode); | |
667 | return dget(sb->s_root); | |
668 | } | |
669 | ||
ba5b8958 | 670 | return d_obtain_alias(inode); |
73f73415 JB |
671 | } |
672 | ||
d397712b | 673 | static int btrfs_fill_super(struct super_block *sb, |
8a4b83cc | 674 | struct btrfs_fs_devices *fs_devices, |
d397712b | 675 | void *data, int silent) |
75dfe396 | 676 | { |
d397712b CM |
677 | struct inode *inode; |
678 | struct dentry *root_dentry; | |
815745cf | 679 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
5d4f98a2 | 680 | struct btrfs_key key; |
39279cc3 | 681 | int err; |
a429e513 | 682 | |
39279cc3 CM |
683 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
684 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
685 | sb->s_op = &btrfs_super_ops; | |
af53d29a | 686 | sb->s_d_op = &btrfs_dentry_operations; |
be6e8dc0 | 687 | sb->s_export_op = &btrfs_export_ops; |
5103e947 | 688 | sb->s_xattr = btrfs_xattr_handlers; |
39279cc3 | 689 | sb->s_time_gran = 1; |
0eda294d | 690 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
33268eaf | 691 | sb->s_flags |= MS_POSIXACL; |
49cf6f45 | 692 | #endif |
a429e513 | 693 | |
ad2b2c80 AV |
694 | err = open_ctree(sb, fs_devices, (char *)data); |
695 | if (err) { | |
39279cc3 | 696 | printk("btrfs: open_ctree failed\n"); |
ad2b2c80 | 697 | return err; |
a429e513 CM |
698 | } |
699 | ||
5d4f98a2 YZ |
700 | key.objectid = BTRFS_FIRST_FREE_OBJECTID; |
701 | key.type = BTRFS_INODE_ITEM_KEY; | |
702 | key.offset = 0; | |
98c7089c | 703 | inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL); |
5d4f98a2 YZ |
704 | if (IS_ERR(inode)) { |
705 | err = PTR_ERR(inode); | |
39279cc3 | 706 | goto fail_close; |
f254e52c | 707 | } |
f254e52c | 708 | |
39279cc3 CM |
709 | root_dentry = d_alloc_root(inode); |
710 | if (!root_dentry) { | |
711 | iput(inode); | |
712 | err = -ENOMEM; | |
713 | goto fail_close; | |
f254e52c | 714 | } |
58176a96 | 715 | |
39279cc3 | 716 | sb->s_root = root_dentry; |
6885f308 | 717 | |
6885f308 | 718 | save_mount_options(sb, data); |
90a887c9 | 719 | cleancache_init_fs(sb); |
59553edf | 720 | sb->s_flags |= MS_ACTIVE; |
2619ba1f | 721 | return 0; |
39279cc3 CM |
722 | |
723 | fail_close: | |
815745cf | 724 | close_ctree(fs_info->tree_root); |
39279cc3 | 725 | return err; |
2619ba1f CM |
726 | } |
727 | ||
6bf13c0c | 728 | int btrfs_sync_fs(struct super_block *sb, int wait) |
c5739bba CM |
729 | { |
730 | struct btrfs_trans_handle *trans; | |
815745cf AV |
731 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
732 | struct btrfs_root *root = fs_info->tree_root; | |
c5739bba | 733 | int ret; |
2619ba1f | 734 | |
1abe9b8a | 735 | trace_btrfs_sync_fs(wait); |
736 | ||
39279cc3 | 737 | if (!wait) { |
815745cf | 738 | filemap_flush(fs_info->btree_inode->i_mapping); |
39279cc3 CM |
739 | return 0; |
740 | } | |
771ed689 | 741 | |
24bbcf04 YZ |
742 | btrfs_start_delalloc_inodes(root, 0); |
743 | btrfs_wait_ordered_extents(root, 0, 0); | |
771ed689 | 744 | |
a22285a6 | 745 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
746 | if (IS_ERR(trans)) |
747 | return PTR_ERR(trans); | |
c5739bba | 748 | ret = btrfs_commit_transaction(trans, root); |
54aa1f4d | 749 | return ret; |
2c90e5d6 CM |
750 | } |
751 | ||
34c80b1d | 752 | static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) |
a9572a15 | 753 | { |
815745cf AV |
754 | struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); |
755 | struct btrfs_root *root = info->tree_root; | |
200da64e | 756 | char *compress_type; |
a9572a15 EP |
757 | |
758 | if (btrfs_test_opt(root, DEGRADED)) | |
759 | seq_puts(seq, ",degraded"); | |
760 | if (btrfs_test_opt(root, NODATASUM)) | |
761 | seq_puts(seq, ",nodatasum"); | |
762 | if (btrfs_test_opt(root, NODATACOW)) | |
763 | seq_puts(seq, ",nodatacow"); | |
764 | if (btrfs_test_opt(root, NOBARRIER)) | |
765 | seq_puts(seq, ",nobarrier"); | |
a9572a15 | 766 | if (info->max_inline != 8192 * 1024) |
21380931 JB |
767 | seq_printf(seq, ",max_inline=%llu", |
768 | (unsigned long long)info->max_inline); | |
a9572a15 | 769 | if (info->alloc_start != 0) |
21380931 JB |
770 | seq_printf(seq, ",alloc_start=%llu", |
771 | (unsigned long long)info->alloc_start); | |
a9572a15 EP |
772 | if (info->thread_pool_size != min_t(unsigned long, |
773 | num_online_cpus() + 2, 8)) | |
774 | seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); | |
200da64e TI |
775 | if (btrfs_test_opt(root, COMPRESS)) { |
776 | if (info->compress_type == BTRFS_COMPRESS_ZLIB) | |
777 | compress_type = "zlib"; | |
778 | else | |
779 | compress_type = "lzo"; | |
780 | if (btrfs_test_opt(root, FORCE_COMPRESS)) | |
781 | seq_printf(seq, ",compress-force=%s", compress_type); | |
782 | else | |
783 | seq_printf(seq, ",compress=%s", compress_type); | |
784 | } | |
c289811c CM |
785 | if (btrfs_test_opt(root, NOSSD)) |
786 | seq_puts(seq, ",nossd"); | |
451d7585 CM |
787 | if (btrfs_test_opt(root, SSD_SPREAD)) |
788 | seq_puts(seq, ",ssd_spread"); | |
789 | else if (btrfs_test_opt(root, SSD)) | |
a9572a15 | 790 | seq_puts(seq, ",ssd"); |
3a5e1404 | 791 | if (btrfs_test_opt(root, NOTREELOG)) |
6b65c5c6 | 792 | seq_puts(seq, ",notreelog"); |
dccae999 | 793 | if (btrfs_test_opt(root, FLUSHONCOMMIT)) |
6b65c5c6 | 794 | seq_puts(seq, ",flushoncommit"); |
20a5239a MW |
795 | if (btrfs_test_opt(root, DISCARD)) |
796 | seq_puts(seq, ",discard"); | |
a9572a15 EP |
797 | if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) |
798 | seq_puts(seq, ",noacl"); | |
200da64e TI |
799 | if (btrfs_test_opt(root, SPACE_CACHE)) |
800 | seq_puts(seq, ",space_cache"); | |
73bc1876 | 801 | else |
8965593e | 802 | seq_puts(seq, ",nospace_cache"); |
200da64e TI |
803 | if (btrfs_test_opt(root, CLEAR_CACHE)) |
804 | seq_puts(seq, ",clear_cache"); | |
805 | if (btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) | |
806 | seq_puts(seq, ",user_subvol_rm_allowed"); | |
0942caa3 DS |
807 | if (btrfs_test_opt(root, ENOSPC_DEBUG)) |
808 | seq_puts(seq, ",enospc_debug"); | |
809 | if (btrfs_test_opt(root, AUTO_DEFRAG)) | |
810 | seq_puts(seq, ",autodefrag"); | |
811 | if (btrfs_test_opt(root, INODE_MAP_CACHE)) | |
812 | seq_puts(seq, ",inode_cache"); | |
9555c6c1 ID |
813 | if (btrfs_test_opt(root, SKIP_BALANCE)) |
814 | seq_puts(seq, ",skip_balance"); | |
8c342930 JM |
815 | if (btrfs_test_opt(root, PANIC_ON_FATAL_ERROR)) |
816 | seq_puts(seq, ",fatal_errors=panic"); | |
a9572a15 EP |
817 | return 0; |
818 | } | |
819 | ||
a061fc8d | 820 | static int btrfs_test_super(struct super_block *s, void *data) |
4b82d6e4 | 821 | { |
815745cf AV |
822 | struct btrfs_fs_info *p = data; |
823 | struct btrfs_fs_info *fs_info = btrfs_sb(s); | |
4b82d6e4 | 824 | |
815745cf | 825 | return fs_info->fs_devices == p->fs_devices; |
4b82d6e4 Y |
826 | } |
827 | ||
450ba0ea JB |
828 | static int btrfs_set_super(struct super_block *s, void *data) |
829 | { | |
6de1d09d AV |
830 | int err = set_anon_super(s, data); |
831 | if (!err) | |
832 | s->s_fs_info = data; | |
833 | return err; | |
4b82d6e4 Y |
834 | } |
835 | ||
f9d9ef62 DS |
836 | /* |
837 | * subvolumes are identified by ino 256 | |
838 | */ | |
839 | static inline int is_subvolume_inode(struct inode *inode) | |
840 | { | |
841 | if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) | |
842 | return 1; | |
843 | return 0; | |
844 | } | |
845 | ||
830c4adb JB |
846 | /* |
847 | * This will strip out the subvol=%s argument for an argument string and add | |
848 | * subvolid=0 to make sure we get the actual tree root for path walking to the | |
849 | * subvol we want. | |
850 | */ | |
851 | static char *setup_root_args(char *args) | |
852 | { | |
853 | unsigned copied = 0; | |
854 | unsigned len = strlen(args) + 2; | |
855 | char *pos; | |
856 | char *ret; | |
857 | ||
858 | /* | |
859 | * We need the same args as before, but minus | |
860 | * | |
861 | * subvol=a | |
862 | * | |
863 | * and add | |
864 | * | |
865 | * subvolid=0 | |
866 | * | |
867 | * which is a difference of 2 characters, so we allocate strlen(args) + | |
868 | * 2 characters. | |
869 | */ | |
870 | ret = kzalloc(len * sizeof(char), GFP_NOFS); | |
871 | if (!ret) | |
872 | return NULL; | |
873 | pos = strstr(args, "subvol="); | |
874 | ||
875 | /* This shouldn't happen, but just in case.. */ | |
876 | if (!pos) { | |
877 | kfree(ret); | |
878 | return NULL; | |
879 | } | |
880 | ||
881 | /* | |
882 | * The subvol=<> arg is not at the front of the string, copy everybody | |
883 | * up to that into ret. | |
884 | */ | |
885 | if (pos != args) { | |
886 | *pos = '\0'; | |
887 | strcpy(ret, args); | |
888 | copied += strlen(args); | |
889 | pos++; | |
890 | } | |
891 | ||
892 | strncpy(ret + copied, "subvolid=0", len - copied); | |
893 | ||
894 | /* Length of subvolid=0 */ | |
895 | copied += 10; | |
896 | ||
897 | /* | |
898 | * If there is no , after the subvol= option then we know there's no | |
899 | * other options and we can just return. | |
900 | */ | |
901 | pos = strchr(pos, ','); | |
902 | if (!pos) | |
903 | return ret; | |
904 | ||
905 | /* Copy the rest of the arguments into our buffer */ | |
906 | strncpy(ret + copied, pos, len - copied); | |
907 | copied += strlen(pos); | |
908 | ||
909 | return ret; | |
910 | } | |
911 | ||
912 | static struct dentry *mount_subvol(const char *subvol_name, int flags, | |
913 | const char *device_name, char *data) | |
914 | { | |
830c4adb JB |
915 | struct dentry *root; |
916 | struct vfsmount *mnt; | |
830c4adb | 917 | char *newargs; |
830c4adb JB |
918 | |
919 | newargs = setup_root_args(data); | |
920 | if (!newargs) | |
921 | return ERR_PTR(-ENOMEM); | |
922 | mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name, | |
923 | newargs); | |
924 | kfree(newargs); | |
925 | if (IS_ERR(mnt)) | |
926 | return ERR_CAST(mnt); | |
927 | ||
ea441d11 | 928 | root = mount_subtree(mnt, subvol_name); |
830c4adb | 929 | |
ea441d11 AV |
930 | if (!IS_ERR(root) && !is_subvolume_inode(root->d_inode)) { |
931 | struct super_block *s = root->d_sb; | |
932 | dput(root); | |
933 | root = ERR_PTR(-EINVAL); | |
934 | deactivate_locked_super(s); | |
f9d9ef62 DS |
935 | printk(KERN_ERR "btrfs: '%s' is not a valid subvolume\n", |
936 | subvol_name); | |
f9d9ef62 DS |
937 | } |
938 | ||
830c4adb JB |
939 | return root; |
940 | } | |
450ba0ea | 941 | |
edf24abe CH |
942 | /* |
943 | * Find a superblock for the given device / mount point. | |
944 | * | |
945 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions | |
946 | * for multiple device setup. Make sure to keep it in sync. | |
947 | */ | |
061dbc6b | 948 | static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, |
306e16ce | 949 | const char *device_name, void *data) |
4b82d6e4 Y |
950 | { |
951 | struct block_device *bdev = NULL; | |
952 | struct super_block *s; | |
953 | struct dentry *root; | |
8a4b83cc | 954 | struct btrfs_fs_devices *fs_devices = NULL; |
450ba0ea | 955 | struct btrfs_fs_info *fs_info = NULL; |
97288f2c | 956 | fmode_t mode = FMODE_READ; |
73f73415 JB |
957 | char *subvol_name = NULL; |
958 | u64 subvol_objectid = 0; | |
e15d0542 | 959 | u64 subvol_rootid = 0; |
4b82d6e4 Y |
960 | int error = 0; |
961 | ||
97288f2c CH |
962 | if (!(flags & MS_RDONLY)) |
963 | mode |= FMODE_WRITE; | |
964 | ||
965 | error = btrfs_parse_early_options(data, mode, fs_type, | |
73f73415 | 966 | &subvol_name, &subvol_objectid, |
e15d0542 | 967 | &subvol_rootid, &fs_devices); |
f23c8af8 ID |
968 | if (error) { |
969 | kfree(subvol_name); | |
061dbc6b | 970 | return ERR_PTR(error); |
f23c8af8 | 971 | } |
edf24abe | 972 | |
830c4adb JB |
973 | if (subvol_name) { |
974 | root = mount_subvol(subvol_name, flags, device_name, data); | |
975 | kfree(subvol_name); | |
976 | return root; | |
977 | } | |
978 | ||
306e16ce | 979 | error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); |
8a4b83cc | 980 | if (error) |
830c4adb | 981 | return ERR_PTR(error); |
4b82d6e4 | 982 | |
450ba0ea JB |
983 | /* |
984 | * Setup a dummy root and fs_info for test/set super. This is because | |
985 | * we don't actually fill this stuff out until open_ctree, but we need | |
986 | * it for searching for existing supers, so this lets us do that and | |
987 | * then open_ctree will properly initialize everything later. | |
988 | */ | |
989 | fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS); | |
04d21a24 ID |
990 | if (!fs_info) |
991 | return ERR_PTR(-ENOMEM); | |
992 | ||
450ba0ea | 993 | fs_info->fs_devices = fs_devices; |
450ba0ea | 994 | |
6c41761f DS |
995 | fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); |
996 | fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); | |
997 | if (!fs_info->super_copy || !fs_info->super_for_commit) { | |
998 | error = -ENOMEM; | |
04d21a24 ID |
999 | goto error_fs_info; |
1000 | } | |
1001 | ||
1002 | error = btrfs_open_devices(fs_devices, mode, fs_type); | |
1003 | if (error) | |
1004 | goto error_fs_info; | |
1005 | ||
1006 | if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { | |
1007 | error = -EACCES; | |
6c41761f DS |
1008 | goto error_close_devices; |
1009 | } | |
1010 | ||
dfe25020 | 1011 | bdev = fs_devices->latest_bdev; |
815745cf | 1012 | s = sget(fs_type, btrfs_test_super, btrfs_set_super, fs_info); |
830c4adb JB |
1013 | if (IS_ERR(s)) { |
1014 | error = PTR_ERR(s); | |
1015 | goto error_close_devices; | |
1016 | } | |
4b82d6e4 Y |
1017 | |
1018 | if (s->s_root) { | |
2b82032c | 1019 | btrfs_close_devices(fs_devices); |
6c41761f | 1020 | free_fs_info(fs_info); |
59553edf AV |
1021 | if ((flags ^ s->s_flags) & MS_RDONLY) |
1022 | error = -EBUSY; | |
4b82d6e4 Y |
1023 | } else { |
1024 | char b[BDEVNAME_SIZE]; | |
1025 | ||
9e1f1de0 | 1026 | s->s_flags = flags | MS_NOSEC; |
4b82d6e4 | 1027 | strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); |
815745cf | 1028 | btrfs_sb(s)->bdev_holder = fs_type; |
8a4b83cc CM |
1029 | error = btrfs_fill_super(s, fs_devices, data, |
1030 | flags & MS_SILENT ? 1 : 0); | |
4b82d6e4 Y |
1031 | } |
1032 | ||
59553edf AV |
1033 | root = !error ? get_default_root(s, subvol_objectid) : ERR_PTR(error); |
1034 | if (IS_ERR(root)) | |
830c4adb | 1035 | deactivate_locked_super(s); |
4b82d6e4 | 1036 | |
061dbc6b | 1037 | return root; |
4b82d6e4 | 1038 | |
c146afad | 1039 | error_close_devices: |
8a4b83cc | 1040 | btrfs_close_devices(fs_devices); |
04d21a24 | 1041 | error_fs_info: |
6c41761f | 1042 | free_fs_info(fs_info); |
061dbc6b | 1043 | return ERR_PTR(error); |
4b82d6e4 | 1044 | } |
2e635a27 | 1045 | |
c146afad YZ |
1046 | static int btrfs_remount(struct super_block *sb, int *flags, char *data) |
1047 | { | |
815745cf AV |
1048 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
1049 | struct btrfs_root *root = fs_info->tree_root; | |
c146afad YZ |
1050 | int ret; |
1051 | ||
b288052e CM |
1052 | ret = btrfs_parse_options(root, data); |
1053 | if (ret) | |
1054 | return -EINVAL; | |
1055 | ||
c146afad YZ |
1056 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
1057 | return 0; | |
1058 | ||
1059 | if (*flags & MS_RDONLY) { | |
1060 | sb->s_flags |= MS_RDONLY; | |
1061 | ||
1062 | ret = btrfs_commit_super(root); | |
1063 | WARN_ON(ret); | |
1064 | } else { | |
815745cf | 1065 | if (fs_info->fs_devices->rw_devices == 0) |
2b82032c YZ |
1066 | return -EACCES; |
1067 | ||
815745cf | 1068 | if (btrfs_super_log_root(fs_info->super_copy) != 0) |
c146afad YZ |
1069 | return -EINVAL; |
1070 | ||
815745cf | 1071 | ret = btrfs_cleanup_fs_roots(fs_info); |
c146afad YZ |
1072 | WARN_ON(ret); |
1073 | ||
d68fc57b YZ |
1074 | /* recover relocation */ |
1075 | ret = btrfs_recover_relocation(root); | |
c146afad YZ |
1076 | WARN_ON(ret); |
1077 | ||
1078 | sb->s_flags &= ~MS_RDONLY; | |
1079 | } | |
1080 | ||
1081 | return 0; | |
1082 | } | |
1083 | ||
bcd53741 AJ |
1084 | /* Used to sort the devices by max_avail(descending sort) */ |
1085 | static int btrfs_cmp_device_free_bytes(const void *dev_info1, | |
1086 | const void *dev_info2) | |
1087 | { | |
1088 | if (((struct btrfs_device_info *)dev_info1)->max_avail > | |
1089 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
1090 | return -1; | |
1091 | else if (((struct btrfs_device_info *)dev_info1)->max_avail < | |
1092 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
1093 | return 1; | |
1094 | else | |
1095 | return 0; | |
1096 | } | |
1097 | ||
1098 | /* | |
1099 | * sort the devices by max_avail, in which max free extent size of each device | |
1100 | * is stored.(Descending Sort) | |
1101 | */ | |
1102 | static inline void btrfs_descending_sort_devices( | |
1103 | struct btrfs_device_info *devices, | |
1104 | size_t nr_devices) | |
1105 | { | |
1106 | sort(devices, nr_devices, sizeof(struct btrfs_device_info), | |
1107 | btrfs_cmp_device_free_bytes, NULL); | |
1108 | } | |
1109 | ||
6d07bcec MX |
1110 | /* |
1111 | * The helper to calc the free space on the devices that can be used to store | |
1112 | * file data. | |
1113 | */ | |
1114 | static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes) | |
1115 | { | |
1116 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1117 | struct btrfs_device_info *devices_info; | |
1118 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
1119 | struct btrfs_device *device; | |
1120 | u64 skip_space; | |
1121 | u64 type; | |
1122 | u64 avail_space; | |
1123 | u64 used_space; | |
1124 | u64 min_stripe_size; | |
39fb26c3 | 1125 | int min_stripes = 1, num_stripes = 1; |
6d07bcec MX |
1126 | int i = 0, nr_devices; |
1127 | int ret; | |
1128 | ||
b772a86e | 1129 | nr_devices = fs_info->fs_devices->open_devices; |
6d07bcec MX |
1130 | BUG_ON(!nr_devices); |
1131 | ||
1132 | devices_info = kmalloc(sizeof(*devices_info) * nr_devices, | |
1133 | GFP_NOFS); | |
1134 | if (!devices_info) | |
1135 | return -ENOMEM; | |
1136 | ||
1137 | /* calc min stripe number for data space alloction */ | |
1138 | type = btrfs_get_alloc_profile(root, 1); | |
39fb26c3 | 1139 | if (type & BTRFS_BLOCK_GROUP_RAID0) { |
6d07bcec | 1140 | min_stripes = 2; |
39fb26c3 MX |
1141 | num_stripes = nr_devices; |
1142 | } else if (type & BTRFS_BLOCK_GROUP_RAID1) { | |
6d07bcec | 1143 | min_stripes = 2; |
39fb26c3 MX |
1144 | num_stripes = 2; |
1145 | } else if (type & BTRFS_BLOCK_GROUP_RAID10) { | |
6d07bcec | 1146 | min_stripes = 4; |
39fb26c3 MX |
1147 | num_stripes = 4; |
1148 | } | |
6d07bcec MX |
1149 | |
1150 | if (type & BTRFS_BLOCK_GROUP_DUP) | |
1151 | min_stripe_size = 2 * BTRFS_STRIPE_LEN; | |
1152 | else | |
1153 | min_stripe_size = BTRFS_STRIPE_LEN; | |
1154 | ||
b772a86e LZ |
1155 | list_for_each_entry(device, &fs_devices->devices, dev_list) { |
1156 | if (!device->in_fs_metadata || !device->bdev) | |
6d07bcec MX |
1157 | continue; |
1158 | ||
1159 | avail_space = device->total_bytes - device->bytes_used; | |
1160 | ||
1161 | /* align with stripe_len */ | |
1162 | do_div(avail_space, BTRFS_STRIPE_LEN); | |
1163 | avail_space *= BTRFS_STRIPE_LEN; | |
1164 | ||
1165 | /* | |
1166 | * In order to avoid overwritting the superblock on the drive, | |
1167 | * btrfs starts at an offset of at least 1MB when doing chunk | |
1168 | * allocation. | |
1169 | */ | |
1170 | skip_space = 1024 * 1024; | |
1171 | ||
1172 | /* user can set the offset in fs_info->alloc_start. */ | |
1173 | if (fs_info->alloc_start + BTRFS_STRIPE_LEN <= | |
1174 | device->total_bytes) | |
1175 | skip_space = max(fs_info->alloc_start, skip_space); | |
1176 | ||
1177 | /* | |
1178 | * btrfs can not use the free space in [0, skip_space - 1], | |
1179 | * we must subtract it from the total. In order to implement | |
1180 | * it, we account the used space in this range first. | |
1181 | */ | |
1182 | ret = btrfs_account_dev_extents_size(device, 0, skip_space - 1, | |
1183 | &used_space); | |
1184 | if (ret) { | |
1185 | kfree(devices_info); | |
1186 | return ret; | |
1187 | } | |
1188 | ||
1189 | /* calc the free space in [0, skip_space - 1] */ | |
1190 | skip_space -= used_space; | |
1191 | ||
1192 | /* | |
1193 | * we can use the free space in [0, skip_space - 1], subtract | |
1194 | * it from the total. | |
1195 | */ | |
1196 | if (avail_space && avail_space >= skip_space) | |
1197 | avail_space -= skip_space; | |
1198 | else | |
1199 | avail_space = 0; | |
1200 | ||
1201 | if (avail_space < min_stripe_size) | |
1202 | continue; | |
1203 | ||
1204 | devices_info[i].dev = device; | |
1205 | devices_info[i].max_avail = avail_space; | |
1206 | ||
1207 | i++; | |
1208 | } | |
1209 | ||
1210 | nr_devices = i; | |
1211 | ||
1212 | btrfs_descending_sort_devices(devices_info, nr_devices); | |
1213 | ||
1214 | i = nr_devices - 1; | |
1215 | avail_space = 0; | |
1216 | while (nr_devices >= min_stripes) { | |
39fb26c3 MX |
1217 | if (num_stripes > nr_devices) |
1218 | num_stripes = nr_devices; | |
1219 | ||
6d07bcec MX |
1220 | if (devices_info[i].max_avail >= min_stripe_size) { |
1221 | int j; | |
1222 | u64 alloc_size; | |
1223 | ||
39fb26c3 | 1224 | avail_space += devices_info[i].max_avail * num_stripes; |
6d07bcec | 1225 | alloc_size = devices_info[i].max_avail; |
39fb26c3 | 1226 | for (j = i + 1 - num_stripes; j <= i; j++) |
6d07bcec MX |
1227 | devices_info[j].max_avail -= alloc_size; |
1228 | } | |
1229 | i--; | |
1230 | nr_devices--; | |
1231 | } | |
1232 | ||
1233 | kfree(devices_info); | |
1234 | *free_bytes = avail_space; | |
1235 | return 0; | |
1236 | } | |
1237 | ||
8fd17795 CM |
1238 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1239 | { | |
815745cf AV |
1240 | struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); |
1241 | struct btrfs_super_block *disk_super = fs_info->super_copy; | |
1242 | struct list_head *head = &fs_info->space_info; | |
bd4d1088 JB |
1243 | struct btrfs_space_info *found; |
1244 | u64 total_used = 0; | |
6d07bcec | 1245 | u64 total_free_data = 0; |
db94535d | 1246 | int bits = dentry->d_sb->s_blocksize_bits; |
815745cf | 1247 | __be32 *fsid = (__be32 *)fs_info->fsid; |
6d07bcec | 1248 | int ret; |
8fd17795 | 1249 | |
6d07bcec | 1250 | /* holding chunk_muext to avoid allocating new chunks */ |
815745cf | 1251 | mutex_lock(&fs_info->chunk_mutex); |
bd4d1088 | 1252 | rcu_read_lock(); |
89a55897 | 1253 | list_for_each_entry_rcu(found, head, list) { |
6d07bcec MX |
1254 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) { |
1255 | total_free_data += found->disk_total - found->disk_used; | |
1256 | total_free_data -= | |
1257 | btrfs_account_ro_block_groups_free_space(found); | |
1258 | } | |
1259 | ||
b742bb82 | 1260 | total_used += found->disk_used; |
89a55897 | 1261 | } |
bd4d1088 JB |
1262 | rcu_read_unlock(); |
1263 | ||
8fd17795 | 1264 | buf->f_namelen = BTRFS_NAME_LEN; |
db94535d | 1265 | buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; |
bd4d1088 | 1266 | buf->f_bfree = buf->f_blocks - (total_used >> bits); |
8fd17795 CM |
1267 | buf->f_bsize = dentry->d_sb->s_blocksize; |
1268 | buf->f_type = BTRFS_SUPER_MAGIC; | |
6d07bcec | 1269 | buf->f_bavail = total_free_data; |
815745cf | 1270 | ret = btrfs_calc_avail_data_space(fs_info->tree_root, &total_free_data); |
6d07bcec | 1271 | if (ret) { |
815745cf | 1272 | mutex_unlock(&fs_info->chunk_mutex); |
6d07bcec MX |
1273 | return ret; |
1274 | } | |
1275 | buf->f_bavail += total_free_data; | |
1276 | buf->f_bavail = buf->f_bavail >> bits; | |
815745cf | 1277 | mutex_unlock(&fs_info->chunk_mutex); |
d397712b | 1278 | |
9d03632e | 1279 | /* We treat it as constant endianness (it doesn't matter _which_) |
d397712b | 1280 | because we want the fsid to come out the same whether mounted |
9d03632e DW |
1281 | on a big-endian or little-endian host */ |
1282 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); | |
1283 | buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); | |
32d48fa1 DW |
1284 | /* Mask in the root object ID too, to disambiguate subvols */ |
1285 | buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32; | |
1286 | buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid; | |
1287 | ||
8fd17795 CM |
1288 | return 0; |
1289 | } | |
b5133862 | 1290 | |
aea52e19 AV |
1291 | static void btrfs_kill_super(struct super_block *sb) |
1292 | { | |
815745cf | 1293 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
aea52e19 | 1294 | kill_anon_super(sb); |
d22ca7de | 1295 | free_fs_info(fs_info); |
aea52e19 AV |
1296 | } |
1297 | ||
2e635a27 CM |
1298 | static struct file_system_type btrfs_fs_type = { |
1299 | .owner = THIS_MODULE, | |
1300 | .name = "btrfs", | |
061dbc6b | 1301 | .mount = btrfs_mount, |
aea52e19 | 1302 | .kill_sb = btrfs_kill_super, |
2e635a27 CM |
1303 | .fs_flags = FS_REQUIRES_DEV, |
1304 | }; | |
a9218f6b | 1305 | |
d352ac68 CM |
1306 | /* |
1307 | * used by btrfsctl to scan devices when no FS is mounted | |
1308 | */ | |
8a4b83cc CM |
1309 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
1310 | unsigned long arg) | |
1311 | { | |
1312 | struct btrfs_ioctl_vol_args *vol; | |
1313 | struct btrfs_fs_devices *fs_devices; | |
c071fcfd | 1314 | int ret = -ENOTTY; |
8a4b83cc | 1315 | |
e441d54d CM |
1316 | if (!capable(CAP_SYS_ADMIN)) |
1317 | return -EPERM; | |
1318 | ||
dae7b665 LZ |
1319 | vol = memdup_user((void __user *)arg, sizeof(*vol)); |
1320 | if (IS_ERR(vol)) | |
1321 | return PTR_ERR(vol); | |
c071fcfd | 1322 | |
8a4b83cc CM |
1323 | switch (cmd) { |
1324 | case BTRFS_IOC_SCAN_DEV: | |
97288f2c | 1325 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, |
8a4b83cc CM |
1326 | &btrfs_fs_type, &fs_devices); |
1327 | break; | |
1328 | } | |
dae7b665 | 1329 | |
8a4b83cc | 1330 | kfree(vol); |
f819d837 | 1331 | return ret; |
8a4b83cc CM |
1332 | } |
1333 | ||
0176260f | 1334 | static int btrfs_freeze(struct super_block *sb) |
ed0dab6b | 1335 | { |
815745cf AV |
1336 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
1337 | mutex_lock(&fs_info->transaction_kthread_mutex); | |
1338 | mutex_lock(&fs_info->cleaner_mutex); | |
0176260f | 1339 | return 0; |
ed0dab6b Y |
1340 | } |
1341 | ||
0176260f | 1342 | static int btrfs_unfreeze(struct super_block *sb) |
ed0dab6b | 1343 | { |
815745cf AV |
1344 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
1345 | mutex_unlock(&fs_info->cleaner_mutex); | |
1346 | mutex_unlock(&fs_info->transaction_kthread_mutex); | |
0176260f | 1347 | return 0; |
ed0dab6b | 1348 | } |
2e635a27 | 1349 | |
22c44fe6 JB |
1350 | static void btrfs_fs_dirty_inode(struct inode *inode, int flags) |
1351 | { | |
1352 | int ret; | |
1353 | ||
1354 | ret = btrfs_dirty_inode(inode); | |
1355 | if (ret) | |
1356 | printk_ratelimited(KERN_ERR "btrfs: fail to dirty inode %Lu " | |
1357 | "error %d\n", btrfs_ino(inode), ret); | |
1358 | } | |
1359 | ||
b87221de | 1360 | static const struct super_operations btrfs_super_ops = { |
76dda93c | 1361 | .drop_inode = btrfs_drop_inode, |
bd555975 | 1362 | .evict_inode = btrfs_evict_inode, |
e20d96d6 | 1363 | .put_super = btrfs_put_super, |
d5719762 | 1364 | .sync_fs = btrfs_sync_fs, |
a9572a15 | 1365 | .show_options = btrfs_show_options, |
4730a4bc | 1366 | .write_inode = btrfs_write_inode, |
22c44fe6 | 1367 | .dirty_inode = btrfs_fs_dirty_inode, |
2c90e5d6 CM |
1368 | .alloc_inode = btrfs_alloc_inode, |
1369 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 1370 | .statfs = btrfs_statfs, |
c146afad | 1371 | .remount_fs = btrfs_remount, |
0176260f LT |
1372 | .freeze_fs = btrfs_freeze, |
1373 | .unfreeze_fs = btrfs_unfreeze, | |
e20d96d6 | 1374 | }; |
a9218f6b CM |
1375 | |
1376 | static const struct file_operations btrfs_ctl_fops = { | |
1377 | .unlocked_ioctl = btrfs_control_ioctl, | |
1378 | .compat_ioctl = btrfs_control_ioctl, | |
1379 | .owner = THIS_MODULE, | |
6038f373 | 1380 | .llseek = noop_llseek, |
a9218f6b CM |
1381 | }; |
1382 | ||
1383 | static struct miscdevice btrfs_misc = { | |
578454ff | 1384 | .minor = BTRFS_MINOR, |
a9218f6b CM |
1385 | .name = "btrfs-control", |
1386 | .fops = &btrfs_ctl_fops | |
1387 | }; | |
1388 | ||
578454ff KS |
1389 | MODULE_ALIAS_MISCDEV(BTRFS_MINOR); |
1390 | MODULE_ALIAS("devname:btrfs-control"); | |
1391 | ||
a9218f6b CM |
1392 | static int btrfs_interface_init(void) |
1393 | { | |
1394 | return misc_register(&btrfs_misc); | |
1395 | } | |
1396 | ||
b2950863 | 1397 | static void btrfs_interface_exit(void) |
a9218f6b CM |
1398 | { |
1399 | if (misc_deregister(&btrfs_misc) < 0) | |
d397712b | 1400 | printk(KERN_INFO "misc_deregister failed for control device"); |
a9218f6b CM |
1401 | } |
1402 | ||
2e635a27 CM |
1403 | static int __init init_btrfs_fs(void) |
1404 | { | |
2c90e5d6 | 1405 | int err; |
58176a96 JB |
1406 | |
1407 | err = btrfs_init_sysfs(); | |
1408 | if (err) | |
1409 | return err; | |
1410 | ||
143bede5 | 1411 | btrfs_init_compress(); |
d1310b2e | 1412 | |
261507a0 LZ |
1413 | err = btrfs_init_cachep(); |
1414 | if (err) | |
1415 | goto free_compress; | |
1416 | ||
d1310b2e | 1417 | err = extent_io_init(); |
2f4cbe64 WB |
1418 | if (err) |
1419 | goto free_cachep; | |
1420 | ||
d1310b2e CM |
1421 | err = extent_map_init(); |
1422 | if (err) | |
1423 | goto free_extent_io; | |
1424 | ||
16cdcec7 | 1425 | err = btrfs_delayed_inode_init(); |
2f4cbe64 WB |
1426 | if (err) |
1427 | goto free_extent_map; | |
c8b97818 | 1428 | |
16cdcec7 MX |
1429 | err = btrfs_interface_init(); |
1430 | if (err) | |
1431 | goto free_delayed_inode; | |
1432 | ||
a9218f6b CM |
1433 | err = register_filesystem(&btrfs_fs_type); |
1434 | if (err) | |
1435 | goto unregister_ioctl; | |
b3c3da71 CM |
1436 | |
1437 | printk(KERN_INFO "%s loaded\n", BTRFS_BUILD_VERSION); | |
2f4cbe64 WB |
1438 | return 0; |
1439 | ||
a9218f6b CM |
1440 | unregister_ioctl: |
1441 | btrfs_interface_exit(); | |
16cdcec7 MX |
1442 | free_delayed_inode: |
1443 | btrfs_delayed_inode_exit(); | |
2f4cbe64 WB |
1444 | free_extent_map: |
1445 | extent_map_exit(); | |
d1310b2e CM |
1446 | free_extent_io: |
1447 | extent_io_exit(); | |
2f4cbe64 WB |
1448 | free_cachep: |
1449 | btrfs_destroy_cachep(); | |
261507a0 LZ |
1450 | free_compress: |
1451 | btrfs_exit_compress(); | |
2f4cbe64 WB |
1452 | btrfs_exit_sysfs(); |
1453 | return err; | |
2e635a27 CM |
1454 | } |
1455 | ||
1456 | static void __exit exit_btrfs_fs(void) | |
1457 | { | |
39279cc3 | 1458 | btrfs_destroy_cachep(); |
16cdcec7 | 1459 | btrfs_delayed_inode_exit(); |
a52d9a80 | 1460 | extent_map_exit(); |
d1310b2e | 1461 | extent_io_exit(); |
a9218f6b | 1462 | btrfs_interface_exit(); |
2e635a27 | 1463 | unregister_filesystem(&btrfs_fs_type); |
58176a96 | 1464 | btrfs_exit_sysfs(); |
8a4b83cc | 1465 | btrfs_cleanup_fs_uuids(); |
261507a0 | 1466 | btrfs_exit_compress(); |
2e635a27 CM |
1467 | } |
1468 | ||
1469 | module_init(init_btrfs_fs) | |
1470 | module_exit(exit_btrfs_fs) | |
1471 | ||
1472 | MODULE_LICENSE("GPL"); |